Vulnerability identifier: #VU42487

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4758

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
rsyslog
Server applications / Other server solutions

Vendor: rsyslog.com

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Double free vulnerability in the writeDataError function in the ElasticSearch plugin (omelasticsearch) in rsyslog before 7.4.2 and before 7.5.2 devel, when errorfile is set to local logging, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted JSON response.

Mitigation
Install update from vendor's website.

Vulnerable software versions

rsyslog: 6.4.2 - 7.5.0

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External links
http://www.openwall.com/lists/oss-security/2013/07/05/2
http://www.rsyslog.com/rsyslog-7-4-2-v7-stable-released/
http://www.rsyslog.com/rsyslog-7-5-2-v7-devel-released/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.